import { EventEmitter } from '../utils';
declare type Key = KeyboardEvent['key'];
declare type KeyboardEvents = {
    /**
     * Emitted when a key is released.
     */
    up: [Key];
    /**
     * Emitted when a key is pressed.
     */
    down: [Key];
};
/**
 * The Set of keys that are actually pressed.
 */
export declare const pressed: Set<string>;
/**
 * The EventEmitter to watch the KeyBoard.
 * @type {EventEmitter<KeyboardEvents>}
 */
export declare const events: EventEmitter<KeyboardEvents>;
/**
 * Test if a key is pressed.
 * @params key - The key to test.
 * @returns - Is pressed.
 */
export declare function isPressed(key: Key | Key[]): boolean;
export {};